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Right ventricular basal inflow and outflow tract diameters overestimate right ventricular size in subjects with sigmoid-shaped interventricular septum: a study using three-dimensional echocardiography

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Abstract

Sigmoid-shaped ventricular septum (SS), a frequently encountered minor abnormality in echocardiographic examinations of the elderly, may have some influence on RV shape. We aimed to determine the influence of SS on the accuracy of the 6 RV linear diameter measurements in the light of three-dimensional echocardiographic (3DE) RV volume. The aorto-septal angle (ASA) was measured in the parasternal long-axis view using two-dimensional echocardiography (2DE) as an index of SS in 70 patients without major cardiac abnormalities who were subdivided into 35 with SS (ASA ≤ 120°) and 35 without SS (NSS). We measured RV end-diastolic volume (RVEDV) using 3DE; in addition, using 2DE, we measured basal RV diameter, mid-cavity diameter, longitudinal diameter and end-diastolic area in the apical four-chamber view; proximal RV outflow tract (RVOT) diameter in the parasternal long-axis view; and proximal and distal RVOT diameters in the parasternal short-axis view. RVEDV did not differ between the SS and NSS groups. The SS group had greater basal RV diameter and proximal and distal RVOT diameters than the NSS group. RV mid-cavity diameter, longitudinal diameter, and end-diastolic area did not differ between the groups. Among the 2DE parameters of RV size, RV end-diastolic area was most strongly correlated with RVEDV (r = 0.67), followed by RV mid-cavity diameter (r = 0.58). When SS is present, the echocardiographic basal RV diameter and RVOT diameters overestimate RV size, and the measurement of RV end-diastolic area and mid-cavity diameter more correctly reflect 3D RV volume.

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Authors and Affiliations

  1. Faculty of Health Sciences, Hokkaido University, Kita-12, Nishi-5, Kita-Ku, Sapporo, 060-0812, Japan

    Kazunori Okada, Sanae Kaga, Nobuo Masauzi & Taisei Mikami

  2. Medical Corporation Hokuseki Group, Kitanodai Clinic, 13-2 Kyouei-cho,1, Kitahirosima, 061-1113, Japan

    Kosuke Tsujita & Yoichi Sakamoto

Authors
  1. Kazunori Okada
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  2. Sanae Kaga
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  3. Kosuke Tsujita
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  5. Nobuo Masauzi
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Correspondence to Kazunori Okada.

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Okada, K., Kaga, S., Tsujita, K. et al. Right ventricular basal inflow and outflow tract diameters overestimate right ventricular size in subjects with sigmoid-shaped interventricular septum: a study using three-dimensional echocardiography. Int J Cardiovasc Imaging 35, 1211–1219 (2019). https://doi.org/10.1007/s10554-019-01536-6

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  • DOI: https://doi.org/10.1007/s10554-019-01536-6

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